Karl Nicolaus Cederquist

Title: Karl Nicolaus Cederquist: Innovator in Digestion Odor Control

Introduction

Karl Nicolaus Cederquist is a notable inventor based in Stockholm, Sweden. He has made significant contributions to the field of pulp production, particularly in the area of odor control during the digestion process. His innovative approach addresses environmental concerns associated with malodorous sulfur compounds.

Latest Patents

Cederquist holds a patent for a method titled "Digestion Odor Control." This invention relates to a continuous method of producing cellulosic pulp from wood chips, achieving yields between 65 to 90 percent. The process involves using a digestion liquor containing sodium sulfide (Na₂S) and sodium carbonate (Na₂CO₃). The digestion occurs at temperatures ranging from 150°C to 190°C, effectively removing malodorous sulfur compounds from the pulp, liquor, and vapors before they exit the digestion process. To eliminate the capacity of these compounds to emit unpleasant odors, molecular oxygen is added to the digester prior to discharging the pulp and spent liquor. The spent liquor is then concentrated and burned for reuse in preparing fresh digesting liquor.

Career Highlights

Cederquist is associated with Defibrator AB, a company that focuses on innovative solutions in the pulp and paper industry. His work has contributed to advancements in sustainable practices within the sector, particularly in reducing environmental impact.

Conclusion

Karl Nicolaus Cederquist's innovative work in digestion odor control exemplifies the importance of addressing environmental challenges in industrial processes. His contributions continue to influence the pulp production industry positively.